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Barley, common name for members of genus Hordeum of the grass family (Gramineae).

Mercury (Hg) is a silvery white metal also known as quicksilver. Mercury is named for the Roman god of commerce, travel and thievery. It has been used for over 3000 years. Its chemical symbol, Hg, is derived from the Latin word hydrargyrum, which means "liquid silver.

A spider is a carnivorous arthropod (segmented, jointed-limbed animal) of the class Arachnida, order Araneae.

Irish moss is a type of seaweed that is commercially harvested in Canada’s Maritime provinces. It is mainly composed of carrageenan, a gelatinous substance. Carrageenan extracted from Irish moss is used as a thickening and gelling agent in foods and other products. It is also used to clarify beverages such as beer.

 Biodiversity is the variety of life (genetic, species and ecosystem levels) on Earth or some part of it. It includes all living forms, plants, animals and micro-organisms. It is the natural wealth of a region that provides resources and ecological services.

For centuries people have argued about the age of the Earth; only recently has it been possible to come close to achieving reliable estimates.

Protection may be achieved by various means, including land-use zoning, long-term agreements with landowners and outright acquisition of land by wildlife agencies. Protected land areas may be designated as national wildlife areas, conservation areas, game reserves, etc.

In Canada, elemental sulphur is recovered from the processing of sour natural gas with a high hydrogen sulphide (H2S) content, and from the refining of high sulphur-bearing crude and heavy oil.

Alfalfa, or lucerne (genus Medicago), is a herbaceous perennial belonging to the legume family and grown as a forage crop.

Biological Oceanography is a branch of oceanography that studies living organisms (ie, the biota) in the sea in relation to their environments.

Canada’s lumber and wood industries convert logs into various products, from lumber to wood chips.

Floods are primarily caused by naturally occurring changes in the height of rivers, lakes and oceans. According to Public Safety Canada, floods are the most common natural hazard in the country and among the costliest. Historic floods have occurred across Canada, with many of the worst happening on major river systems that pass through populated areas. Scientists predict that flooding linked to the impacts of climate change will increase as the 21st century progresses, particularly in coastal areas of the country.

Plate tectonics is the theory proposing that Earth's outer rocky shell is divided into seven major and several smaller rigid plates, and that forces generated by heat losses from the planet's interior constantly move the plates about.

​An earthquake is a vibratory motion generated from the movement of rock along a fault line beneath the Earth’s surface.

Soil conservation is a combination of all methods of management and land use that safeguard the soil against depletion or deterioration by natural or human-induced factors.

The amount of rain or snow that reaches the ground can vary dramatically on any particular given day, even over short distances. Many people have experienced a near-deluge of rain in their backyard, while at the same time their front yard or their neighbour's home remains quite dry.

A wildlife preserve is an area of land or water set aside from at least some forms of development or recreational use, particularly from industrial use, hunting and motorized recreation, to protect wildlife and their habitats.

Termites are social insects of the infraorder Isoptera. They may be thought of as “social cockroaches,” as they evolved from their wood-eating cockroach ancestors approximately 200 million years ago.

A species is endangered if there are threats to its survival. Plants are put at risk for several reasons, including: climate change and the loss of natural habitat to cities, agriculture and industry. In Canada, these activities threaten entire natural ecosystems, such as older forests and Prairie grasslands. As of 2019, a total of 810 species were considered at risk in Canada, including 253 plants. (Other species at risk include animals; see also Endangered Animals in Canada).